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Holden Red HP Block Identification?

Hi all.
I've been given an old holden red motor today, and on one side it's stamped HP. On the other side the engine number is M101XXX. Inside the bore, is't got repco flat-top pistons "RA2027 STD". I'd assume that the motor's had a re-bore to 202 specs?, but what size would have it been as factory? what was it originally out of? and what's its likely displacement?

Cheers!

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this OH link suggests it could be an early 179 Block...the M on the engine number is also aligned to EH holden 179 blocks according to the other link below...
http://holdenpaedia....
https://www.uniqueca...

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Andrew

186 & 202 share the same bore size but all reds up to 186 have the same stroke whilst the 202 has a longer thus giving it more cubes.
So if it has 202 pistons, it not has it had a rebore but it has alson been stroked with a 202 crank.

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Cheers Shane

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HOLDEN DOCTOR

RA2027 STD is most likely just a 186 standard bore piston: http://holdenpaedia....
I believe the 186 has a .040 bigger bore than a 179, which means your HP block has been bored .040 oversize.
HP is just the EH 179 block. M is the engine number prefix for all EH 179 blocks.
It's nothing special. But, someone who believes the myths will probably give you a lot more than it's worth for it.
David

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Old is good.

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